Function checkUnreachable

test/fixtures/snapshot/typescript.js:47683–47717

(node)

            return instanceState === 1 /* ModuleInstanceState.Instantiated */ || (instanceState === 2 /* ModuleInstanceState.ConstEnumOnly */ && ts.shouldPreserveConstEnums(options));
        }
        function checkUnreachable(node) {
            if (!(currentFlow.flags & 1 /* FlowFlags.Unreachable */)) {
                return false;
            }
            if (currentFlow === unreachableFlow) {
                var reportError = 
                // report error on all statements except empty ones
                (ts.isStatementButNotDeclaration(node) && node.kind !== 236 /* SyntaxKind.EmptyStatement */) ||
                    // report error on class declarations
                    node.kind === 257 /* SyntaxKind.ClassDeclaration */ ||
                    // report error on instantiated modules or const-enums only modules if preserveConstEnums is set
                    (node.kind === 261 /* SyntaxKind.ModuleDeclaration */ && shouldReportErrorOnModuleDeclaration(node));
                if (reportError) {
                    currentFlow = reportedUnreachableFlow;
                    if (!options.allowUnreachableCode) {
                        // unreachable code is reported if
                        // - user has explicitly asked about it AND
                        // - statement is in not ambient context (statements in ambient context is already an error
                        //   so we should not report extras) AND
                        //   - node is not variable statement OR
                        //   - node is block scoped variable statement OR
                        //   - node is not block scoped variable statement and at least one variable declaration has initializer
                        //   Rationale: we don't want to report errors on non-initialized var's since they are hoisted
                        //   On the other side we do want to report errors on non-initialized 'lets' because of TDZ
                        var isError_1 = ts.unreachableCodeIsError(options) &&
                            !(node.flags & 16777216 /* NodeFlags.Ambient */) &&
                            (!ts.isVariableStatement(node) ||
                                !!(ts.getCombinedNodeFlags(node.declarationList) & 3 /* NodeFlags.BlockScoped */) ||
                                node.declarationList.declarations.some(function (d) { return !!d.initializer; }));
                        eachUnreachableRange(node, function (start, end) { return errorOrSuggestionOnRange(isError_1, start, end, ts.Diagnostics.Unreachable_code_detected); });
                    }
                }
            }
            return true;
        }
    }
    function eachUnreachableRange(node, cb) {
        if (ts.isStatement(node) && isExecutableStatement(node) && ts.isBlock(node.parent)) {